﻿    <p>
      The <em>IfcPropertyAbstraction</em> is an abstract supertype
      of all property related entities defined as dependent
      resource entities within the specification. It may have an
      external reference to a dictionary or library that provides
      additional information about its definition. Instantiable
      subtypes have property name, value and other instance
      information.
    </p>
    <blockquote class="history">
      HISTORY&nbsp; New entity in IFC4.
    </blockquote>